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Ireland and Britain were both separated from the European continent at about this time (c. 12,000 BCE). The first people arrived in Ireland between 7,000-6,500 BCE at Coleraine in the far north. The Mount Sandel Mesolithic Site, discovered at Coleraine in 1973 CE, is the oldest archaeological site in Ireland.
To the oceanward side of the deep trenches the ocean lithosphere is amongst the oldest on Earth. For example, the oceanic crust adjacent to the Marianas Trench, the deepest trench on Earth, is Jurassic in age and up to 180 Ma old.